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Altera_Forum's avatar
Altera_Forum
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15 years ago

Problems with read transfer

I have connect a simple read-write- component in my system. When i do a read transfer, i only get the hexidecimal value ffffffff and i don't know why.

...

unsigned long read;

read = IORD_32Direct(SIMPLE_RW_0_base,0);

...

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    I think that when you have low active signal (as you did for the read and write enable signals), you need to end their name with _n instead of just n. If SOPC builder doesn't see the _n in the name, it will assume that they are active high signals.

    Either rename then with something that ends with _n or use them as active high signals in your code.